Prediction and experimental verification of normal stress distributions on mould tools during Liquid Composite Moulding
Prediction and experimental verification of normal stress distributions on mould tools during Liquid Composite Moulding
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DOI：
10.1016/j.compositesa.2011.09.028
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发表时间：
2012
影响因子：
8.7
通讯作者：
W. Walbran;B. Verleye;S. Bickerton;P. Kelly
中科院分区：
文献类型：
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作者：
W. Walbran;B. Verleye;S. Bickerton;P. Kelly
用于液体复合材料模塑(LCM)工艺的模具，如树脂转移模塑和压缩RTM，必须承受树脂注射和预制件压实产生的巨大压力。模具力的预测将允许优化安装成本和时间，并优化外围设备(如压力机)的选择。正在开发一种通用的LCM模拟(SimLCM)，能够预测作用在模具工具上的夹紧力和应力分布。在SimLCM中实现了混合弹性和粘弹性加筋压实模型。利用平板零件的几何形状进行了一系列新型刚性刀具的LCM实验，并与SimLCM的结果进行了比较。总的来说，预测是非常好的，在涉及钢筋内部应力松弛的阶段，粘弹性模型比混合弹性模型提供了显著的改进。这项工作的新方面包括测量和预测增强体的空间法向应力分布和随时间变化的应力松弛行为。
Moulds for Liquid Composite Moulding (LCM) processes such as Resin Transfer Moulding and Compression RTM must withstand significant forces generated by resin injection and preform compaction. Prediction of tooling forces will allow optimisation of setup costs and time, and optimal selection of peripheral equipment (such as presses). A generic LCM simulation (SimLCM) is being developed with the capability to predict clamping forces and stress distributions acting on mould tools. Both mixed-elastic and viscoelastic reinforcement compaction models are implemented within SimLCM. A series of novel rigid tool LCM experiments were undertaken using a flat plate part geometry, and are compared to results generated by SimLCM. In general, predictions are very good, with the viscoelastic model providing significant improvement over the mixed-elastic model during phases involving stress relaxation within the reinforcement. Novel aspects of this work include measurement and prediction of spatial normal stress distributions and time dependent stress relaxation behaviour of reinforcements.